Phacopidae

Phacopidae constitute a family of trilobites of the order Phacopida, that includes species that occurred from the Lower Ordovician to the Upper Devonian and had representatives in all paleocontinents. == Description == Like in all Phacopina, the eyes (if present) consist of very large (0.5mm in Phacops rana), separately set lenses without a common...
Found on http://en.wikipedia.org/wiki/Phacopidae
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